This is what the lore of cyberpunk TTRPG looks like. There are concrete facts but also rumors, legends, point of view of the media (which media, owned by which corporation?)..., so it invites us to speculate and not take things for granted, as we should in the real world.
My hypothesis is Dexter was working for Yorinobu all along and T-bug was in on it. First, the trailer is actually a pretty big deal. It means that at some point CDPR considered that plot, whatever changes might have happened between 2019 and launch (maybe back then this was but one branch of possibilities (Jackie dying,...) but then some stuff had to be cut short. Anyway they thought out this plot (Dexter and T-bug together betraying V) and all the implications of such.
Another important clue is that if you wear the eye mod that tags enemies that detected you in kompeki you see that Smasher detects you, as he is looking straight at V. So Smasher and probably Yorinobu know we're there to snatch the relic. What I think happened is that Yorinobu knew his father wouldn't just let Yori take the relic away so he plotted the heist just to get it back unofficially. Then he just loses it and ends up killing his father on the spot.
I believe T-bug told Dexter that V and Jackie are proficient in what they do (V especially, she doesn't really jive with Jackie but he comes with the duo and they end up working well together) AND they are still without a reputation or big affiliations, making them suckers in terms of reputation and desperate to get into the afterlife, but resourceful for the job nonetheless.
Now, with Saburo dead it wouldn't make much difference if V and Jackie make it out of Kompeki, as long as someone from Yorinobu's party gets to the bodies and snatches the relic back.
As far as Dexter and T-bug are concerned, maybe none of them knew they were working for Yorinobu, Dexter didn't, seeing as he kills V and leaves the relic inside. T-bug might have been the one to actually land the job on Dexter, having been contacted by Yorinobu herself. If that's the case, she might have thought things were getting crazy after Saburo's death and left the mission early.
Goro was the wild card in all of this, faithful to Saburo.